Rotary stud fastener and installation thereof



Sept. 21, 1943. l w. H. CHURCHILL- v ROTARY STUD FASTENH AND. INSTALLATION THEREOF Filed oct. 23. 1942 /ll/ L Patented Sept. 21, 1943 e i UNITED STATE ROTARY STUD FASTENER AND INSTALL- v' TION THEREOF A Wilmer' H. Churchill, Saugus, Mass., assignorto H United-Carrv Fastener Corporation, Cambridge, Y Mass., 'a corporation of Massachusetts Application octoberzs, 1942, serial No. 463,035

(o1. aifzzi) 6 Claims.

The present invention relates to rotary stud fastener installations of the type employing a rotary stud member. formed with a lateral projectionVvas for example a radial pin, and mounted in a part to be secured to a support,.which stud member is designed, upon partial rotation, to interlockwith a socket member attached to the support.

Fasteners of the above .described type are extensively used inthe airplaneindustry to secure airplane Cowling and like sheets to their supports. In the manufacture of certain types of planes the sheets or parts to be secured to the support are of non-metallic material, such as ber board or plywood, and are substantially softer than metal sheets. Difculty has been experienced in securely attaching the fastener parts to such softer non-metallicparts.

The present invention aims to improve and simplify generally the construction and eillciency of the means for attaching the rotary stud 'fas-V tener to its 4supporting part, although this same type of part may be used in connectiorwith other parts, such as screws and bolts.

`Illustrative of the invention, reference is made to the accompanying drawing, in which Fig. 1 is a Vertical sectional viewaof a rotary stud fastener installation according to the inven-r tion;

Fig. 2 is a plan outer face of the stud-carrying part;

Fig. 3 is a plan View thereof as viewed from the opposite face thereof, the socket and the sup-y port being removed;

Fig. 4 is a vertical sectional view as taken on the line 4-4 of Fig. 3;

Fig. 5 is a detail perspective view of the studattaching member; and

Fig. 6 is a section like that shown in Fig. 4, but with a round head instead of a dat head stud.

Referring to the drawing, the fastener installation to which the invention relates preferably is of the type` comprising a rotary stud member I formed with radial arms II adapted for locking engagement with a socket member I2 attached to a suitable support I3 and overlying an aperture I4 therein.

The socket member may be of any of the approved types, the type shown herein being selected merely for the purposes of illustration. Conveniently it comprises a base I which may be suitably attached to the support I3, as by rivets I6, and a central outwardly dished portion, apertured as at I'l to permit the passage of the stud I0 and radial arms II, and providing a cam seat view thereof as viewed from the I8 for interlocking Yengagement with the radial Portions I9 integrally:

arms lII of the stud I0. connected with the base I5 on opDOsite sides of the aperture may be bent upwardly and inwardly to provide locking means adapted tooverlie the radial arms II of the studr in its rotated locked position, as will be understood by those skilled in the art. The particular form of socket member I2 illustrated herein is not an essential feature of the invention-and reference ismade to Patent No. 2,306,928, Vgranted December 29,- 1942' a more complete de` to William A. Bedford, for scription'thereof".

The part to be attached to the support and in which the stud member is rotatably mounted is of non-metallic material, such as plywood, fiber board-and the like, and the invention provides improved means forv attaching said fastener part to a sheet of such material. Advantageously said part 25, which is herein illustrated as being of plywood, is provided with a suitable aperture 26 substantially larger than the diameter of the stud I D through which said stud extends.

The stud is rotatably mounted in the aperture 26 of the part 125 by means of 'an attaching plate 21, advantageously formed of thin stiff sheet metal 0f a size substantially largerthan the aper-i The central portion of the plate 21 is ture 26. apertured as at 28` for the passage of the shank of the stud I0, and portions -of the plate surrounding the aperture y28 may be dished to provide a stud head-receiving recess 29 of any desired shape, as illustrated in Figs. 4 and 6. Preferably the stud head-receiving recess is of less diameter than the aperture so that said recess as well as the stud head may be confined within thev planes of the opposed faces of the part 25, or substantially so. Thus either a flat head or round head stud may be used.

The outer peripheral edge of the attaching plate is formed with a plurality of integral prongs 30 extending at right angles therefrom in the direction of the recess. These prongs advantageously are formed with pointed outwardly curved free ends 3I which are capable of being forced straight through the material of the part 25 by pressure applied to the outer face of the attaching plate. f Y

In applying pressure on the attaching plate to force the prongs through the part 25, a metal backing plate (not shown) is usually applied against the opposite face of the part 25. When the outwardly curved pointed ends 3l of the prongs 30 strike the plate, they are curled out- Wardly by the continued pressure so that they are Well clenched and lie wholly embedded in the relatively soft material of the part 25. 'Ihis provides a secure and eective mounting for the fastener part which will not pull out of the relatively soft material of the part 25 even when subjected to unduly heavy stress.

It Will be apparent that the stud member may be pre-assembled with the attaching plate 21 prior to` attachment to the part 25 by merely passing the stud shank through the aperture 28 and thereafter inserting the pin I I through an opening drilled throughthe stud. A'

While I have illustrated and described aP preferred embodiment of my invention, I do not wish to be limited thereby, because the scope of" my invention is best defined by the following.

claims.

I claim:

`ing-said part aperture and the marginal edge portion of said part, said plate-like member havlinga `central aperture within said part aper- Y ture for the passage of the shank of said stud Aand means located on the peripheral edges of l. The combination of a fastener member with l a non-metallic supporting part having an aperture therein; ofmeans for supporting said fastener-member in theaperture of said-part, said means comprising a plate-like member bearing againstV one face of saidpartaround said aper-` ture and supporting said `fastener kmember -therein,and a plurality of 'integral Yprongs onwsaidplate extending through said part'and into the materialfof `said part.

I24. `In 1.a rotary operative fastener 'of the; type comprising arotary-stud anda cooperating socketmember; in combination with a relatively soft plywood" supporting part havingY an. aperture therein, of means for mounting Aone of :the fastener parts in 'the' aperture of said part, said means comprisinga plate-like member bearing against one face ofy said part around said aperture and supporting said fastener part therein,

clenched and a plurality of integral prongs on said platej extending through said part and clenched therein adjacent the opposite face thereof;

3. In a rotary operative fastener of the 4type comprising a rotary stud member andla co operating socket member, in combination with a non-metallic supportingpart having'an aperture' therein and in which one of said members is mounted, of anI attaching means for attaching said member tosaid part comprising a platelike portion of greater size than said aperture and havinga member supporting portion'disz posed therein, said-plate-like portion engaging one `face fof 'saidpart surrounding said' aperture said plate-like member for securing said attaching means to said part.

5. In combination with a non-metallic supporting part having an aperture therein, of a headed rotary stud fastener memberhavingra shank and an enlarged head atone end there-` of, attaching means for rotatably mounting said stud fastener member in saidv part aperture, said attaching means comprising a plate-like mem'-v ber overlying said part aperture and the marginal edge portion of said part, said plate-like member having a stud head-receivingrecess positioned Within said part aperture anda central opening for the lpassage of rthef shank of said' stud, and means located on the 'peripheral edges: of said plate-like member for securing said at` taching means to said part.

6. In combination with a non-metallic supf porting part having an aperture therein, of a headed rotary stud fastener member having a shank and anenlarged head at onef'end thereof, i attaching means for rotatably mounting said" stud fastener member in saidpart aperture, said attaching means comprising a plate-like member overlying said -part aperture and the marginal edge portion of saidpart, said .plate-like member having a stud head-receiving recess positioned within said part aperture and a central opening for the passage of the shankl of said stud, and a plurality of integral prongs connected to 'the said plate-like member and extending through said part and clenched therein adjacent the opposite face thereof.

WILMER H. CHURCHILL. 

